Process for producing brown covering layers on copper

Details Process for producing brown covering layers on copper Process for producing brown covering layers on copper

1991-10-28

1994-02-01

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148282, C23C 810

Patent

active

052828905

ABSTRACT:
A method for producing a uniform and adherent brown covering layer (brown patina) on surfaces of semifinished products made of copper, particularly on rolled tapes or sheets used in building construction. The surface of the copper semifinished product is first roughened by means of a mechanical treatment. The copper semifinished product is then heat treated at a temperature lying within the temperature range of 150.degree. to 650.degree. C. for the duration of 0.1 to 30 minutes. The copper semifinished product can be advantageously subjected to a chemical postoxidation treatment immediately following the heat treatment.

REFERENCES:
patent: 1319508 (1919-10-01), Bengough
patent: 4954185 (1990-07-01), Kohm
The Electrochemical Society, Dighton, pp. 375-380.

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